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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System & Fuel System - 6.6L (LLY) - DTC P0016 To DTC P0341) >> DTC P0106 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: Perform the Circuit/System Verification before proceeding with the Circuit/System Testing.
  1. Verify the integrity of the entire air induction system by inspecting for the following conditions:
    • Any damaged components
    • Loose or improper installation
    • An air flow restriction or leak
    • Verify that restrictions do not exist in MAP sensor port.
    • Any snow or ice build-up at the air cleaner, MAF, and MAP sensor
  2. Determine the altitude for your area.
  3. Ignition ON, engine OFF, observe the scan tool BARO parameter. Compare the BARO parameter to the range specified in the Altitude Vs. Barometric Pressure table. Refer to Altitude Versus Barometric Pressure .
    • If the BARO parameter is outside the range specified, replace the ECM.
  4. Ignition OFF, disconnect the harness connector at the MAP sensor.
  5. Ignition OFF, for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  6. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage.
  7. Verify the scan tool MAP parameter is less than 45 kPa.
    • If greater than 45 kPa, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the ECM.
  8. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the scan tool MAP parameter is greater than 253 kPa.
    • If less than 253 kPa, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  9. If all circuits test normal, test or replace the MAP sensor.
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